I completely agree with your thoughts on the GX-8 replacement! The GX-8's weatherproofing and microphone jack are essential features, especially for those of us who shoot in diverse environments and need more flexibility. Adding the new sensor, LUTs, processor, IBIS, and keeping the swivel EVF would make for an incredible upgrade. It feels like Panasonic could really create something special by combining those features. The GX-9 equivalent doesn't quite offer the same level of versatility, so an updated GX-8 would truly be a dream M4/3 camera!